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A340471 as a simple table

na(n)
12
26
328
490
51488
6945
7182880
89450
98241408
1093555
1114856307200
12638512875
131569400842240
1418243225
155713142135500800
16325641566250
171096948397364019200
1838979295480125
196713362606110031872000
201531329465290625
21408173030347971900211200
2213447856940643125

[2,6,28,90,1488,945,182880,9450,8241408,93555,
 14856307200,638512875,1569400842240,18243225,
 5713142135500800,325641566250,1096948397364019200,
 38979295480125,6713362606110031872000,
 1531329465290625,408173030347971900211200,
 13447856940643125]